Of the 30 Midwestern locations DTN collects spot prices from, all 30 reported their prices decreased between $5 and $35 per ton in the past week, though most increases were in the $5 to $15-per-ton range.

The DTN weekly spot price average fell a whopping $11 per ton in the past two weeks, from $219 per ton May 9 to $208 per ton this week. This is the lowest point the average has reached since mid-February, ...